///////////////////////////////////////////////////////////////////////////

//

// Copyright (c) 2011, Industrial Light & Magic, a division of Lucas

// Digital Ltd. LLC

//

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// *       Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// *       Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// *       Neither the name of Industrial Light & Magic nor the names of

// its contributors may be used to endorse or promote products derived

// from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

///////////////////////////////////////////////////////////////////////////

#include "ImfGenericInputFile.h"

#include <ImfVersion.h>

#include <ImfXdr.h>

#include <Iex.h>

#include <OpenEXRConfig.h>

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_ENTER

void GenericInputFile::readMagicNumberAndVersionField(OPENEXR_IMF_INTERNAL_NAMESPACE::IStream& is, int& version)

{

    //

    // Read the magic number and the file format version number.

    // Then check if we can read the rest of this file.

    //

    int magic;

    OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, magic);

    OPENEXR_IMF_INTERNAL_NAMESPACE::Xdr::read <OPENEXR_IMF_INTERNAL_NAMESPACE::StreamIO> (is, version);

    if (magic != MAGIC)

    {

        throw IEX_NAMESPACE::InputExc ("File is not an image file.");

    }

    if (getVersion (version) != EXR_VERSION)

    {

        THROW (IEX_NAMESPACE::InputExc, "Cannot read "

                              "version " << getVersion (version) << " "

                              "image files.  Current file format version "

                              "is " << EXR_VERSION << ".");

    }

    if (!supportsFlags (getFlags (version)))

    {

        THROW (IEX_NAMESPACE::InputExc, "The file format version number's flag field "

                              "contains unrecognized flags.");

    }

}

OPENEXR_IMF_INTERNAL_NAMESPACE_SOURCE_EXIT